mathsurgery - Processing and representing data; Interpreting and discussing results year 9

All
• Calculate statistics for sets of discrete and continuous data, including with a calculator and spreadsheet; recognise when it is appropriate to use the range, mean, median and mode and, for grouped data, the modal class• Construct graphical representations, on paper and using ICT, and identify which are most useful in the context of the problem. Include:
(i) pie charts for categorical data
(ii) bar charts and frequency diagrams for discrete and continuous data
(iii) simple line graphs for time series
(iv) simple scatter graphs
(v) stem-and-leaf diagrams
• Interpret tables, graphs and diagrams for discrete and continuous data, relating summary statistics and findings to the questions being explored

Most
• Calculate statistics and select those most appropriate to the problem or which address the questions posed
• Select, construct and modify, on paper and using ICT, suitable graphical representations to progress an enquiry and identify key features present in the data. Include:
(i) line graphs for time series
(ii) scatter graphs to develop further understanding of correlation
• Interpret graphs and diagrams and make inferences to support or cast doubt on initial conjectures; have a basic understanding of correlation

Some
• Work through the entire handling data cycle to explore relationships within bi-variate data, including applications to global citizenship, e.g. how fair is our society?
• Use an appropriate range of statistical methods to explore and summarise data; including estimating and finding the mean, median, quartiles and interquartile range for large data sets (by calculation or using a cumulative frequency diagram)
• Select, construct and modify, on paper and using ICT, suitable graphical representation to progress an enquiry and identify key features present in the data. Include:
(i) cumulative frequency tables and diagrams
(ii) box plots
(iii) scatter graphs and lines of best fit (by eye)

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Processing and representing data; Interpreting and discussing results year 9